Means for cooling mill rolls



g- 25, 3 K. B KILBORN 1,820,074

MEANS FOR COOLING MILL ROLLS Filed Dec. 5/1928 fig/ I Patented Au l'zs,lesl UNITED STATES PATENT OFFICE KARL B. KILBORN, OF FAIRLAWN, OHIO,ASSIGNOR TO SEIBERLING RUBBER COMPANY,

' OF BARBERTON, OHIO, A CORPORATION OF DELAWARE MEANS FOR COOLING MILLROLLS Application filed December a, 1928. Serial no. 323,537.

This invention relates to means for cooling the hollow rolls ofrubber-masticatin and other mills by the action of water applied in asuitable manner, as by spraying it against the inner side of the rollwalls. An example of such apparatus is shown in my co-pendingapplication, Serial No. 313,239, filed Oct. 18,

1928. The object of my present invention is to assist in the evaporationof the water and its absorption of heat from the roll by the action ofan air current, thereby enhancing the cooling effect and increasing theefliciency of the .cooling system;

Of the accompanying drawings, Fig. 1 is a longitudinal section of arubber mill having rolls provided with my improved cooling means.

Fig. 2 is a cross-section thereof on the 22 of Fig. 1, on a largerscale.

Fig. 3 is a longitudinal section on a still larger scale showing one ofthe ejectorspray devices.

Fig. 4 is a longitudinal section and elevation showing a modification.

In the. preferred mode of carrying my invention into effect, as shown inFigs. 1 to 3, I employ for each mill-roll one or more ejectors forspraying the water against the inner side of the roll walls, formixingthe 3o spray with air, and for forcing an air currentlongitudinally through the roll to assist in evaporating the water. 10is the mill frame having standards 11, 11 provided with bearings 12, 12for supporting the masticating rolls 13, 13. The roll shown in Fig. 1has afiixed to its mouth end the large driven gear 14 for rotating therolls, and to its other end a smaller gear 15 for mating with acomplemental gear on the shaft of the other roll.

Each roll is hollowed out on its interior to form a central chamber 16which has a discharge-mouth or outlet 17 of approximately the samediameter as the body of sald chamber in order to avoid accumulation of a001 of water of any substantial depth on the oorof said chamber, wherebysubstantially the entire inner periphery of the roll walls is availablefor exposing a film of water to evaporation thereon, as set forth in myprior application, SerialNo. 313,239, previously line trough 18. Saidpipe may be supported in referred to. Thus the roll walls are cooled byconduction of sensible heat to the water film which collects thereon,and also to a large extent by the latent heat of evaporation of saidfilm and of the water spray fed thereto The small stream of by the. jetdevices. excess water discharged from the outlet 17 of the roll-chamberfalls into a stationary trough 18 provided below said outlet andconnected with a suitable drain-pipe. The rolltrunnion at the endopposite the outlet 17 is formed with a prolongation -19 of the cham-'ber 16 Which forms an air-inlet passage leading 'to said chamber.Axially mounted within and extending through the roll 13 is awater-spray pipe 20 having an inlet or supply portion 21 at its outerend and supported at its opposite end on the lip of the discharge theair inlet 19 by a spider 22.

. At suitable intervals along the pipe 20 are mounted ejector devices23, the construction of one of which is shown in detail in Fig; 3 asconsisting of a casting 24 which is centrally formed with a longitudinalthrough-aperture 25 into which sections of the pipe 20 are screwed, andis diagonally drilled from the bore, 25 outwardly with a number of smallwater-spraying jet orifices 26 arranged in a circular series. Saidcasting is also longitudinally formed with a corresponding number ofair-induction passages 27 having flared outlets 28 into which the jetopenings 26 discharge, and is further provided with a splash-hood orbaflle 29 against which a portion of the spreading water-jet from eachof the outlets 26 may impinge to assist in the spraying action. I

I have further shown sleeves 30 with tapered ends mounted upon thewater-pipe 20 posterior to each of the first and second ejector devices23, and extending-between it and the next ejector device, to act aspartial fillers or stream guides for reducin the free space within thechamber '16 and orming a relatively narrow channel adjacent the'walls ofsaid chamber'forthe passage of the mixture of air, water-spray, andwater-vapor. Any suitable number of these sleeves could be employedadjacent the successive ejector .de-

vices and they could be made to act as the water-pipe sections betweensaid devices or could be omitted.

In the operation of this apparatus, the water jets from the openings 26are slantingly discharged in spray form upon the walls of the chamber16, and the water partially collects in a thin film which bathes saidwalls and abstracts the heat therefrom by 10 conduction and evaporation,thus serving to keep the temperature of the roll at a point suitable forthe working of the stock which is subjected to the action of the rolls.The evaporation and refrigerating effect is con- 35 siderably enhancedby the intimate intermixture of the finely-divided water particles withthe air supplied through the passages 27 of each ejector 23 and with theair passing I around said ejector devices, as well as by the Q passageof the air current, induced by the action of these ejectors, over thefilm of water collecting on the walls of the chamber 16, said aircurrent being thus forced through the roll and constantly renewed asfast as 2 it becomes saturated with water-vapor. I am thus enabled todispense with artificial pre-cooling of the water supply for themillrolls, which has heretofore been an item of considerable expense, toreduce the quan- 3 tity of water employed for a given cooling effect andto dispense with any ower for the cooling apparatus other than t e headof a gravity supply or a pumpedsupply of water.

as. Inth difi t' h 'F'.4th

6 mo ca Ion S own In 1g e my hand this th day of November, 1928.

inner side of the walls of a mill-roll 13 havin an interior chamber 16are cooled with a of water from a series-of radial-spraymill-roll whichcomprises supplying water in the form of a film to substantially the en-'tire inner periphery of the roll walls, in relatively small excess overthe evaporative capacity of said walls, and forcing a current ofslightly compressed air longitudinally through the roll to assist theevaporation of said water film.

4:. A mill-roll cooling apparatus comprising, in combination, amill-roll formed withan interior chamber having a free outletsubstantiallyas large in diameter as the chamber, means for sprayingwater into said chamber against the walls thereof, and an air inlet atthe end of said chamber opposite said outlet.

5. A mill-roll cooling a aratus comprising, in combination, a hol owmill-roll, an air ejector on the interior of said roll having its outletslantingly directed against the iImer side of the roll-walls, awater-spray outlet included in said ejector, an air inlet to theejector, a water pipe for supplying the ejector, and anair, water andvapor outlet from the roll.

In witness wheerof I have hereunto set KARL' B. KILBORN.

ing jet devices 31 mounted on an axial water- 40 pipe 20, and an aircurrent is. forced longitudinally through said chamber, withsubstantially the same evaporation efiectas above described, by means ofa fan blower 32 whose outlet-pipe 33 telesco es within the air-inlet 46passage 19 of said r0 1.

Various other modifications could be made without departing from thespirit of my invention as defined in the appended claims.

For example, the air-current could be employed as described forevaporatin a spray or film of water in the interior 0 j an ordinarymill-roll having a free outlet of smaller diameter than the interiorchamber, which retains a 001 of water in the lower part of 65 said chainr; in which caseth'ere would be an enhanced cooling effect as comparedwith the ordinary water injection employed with such rolls, though notas great an improvement as where the entire inner surface is ex- '60posed for evaporation as herein described.

. Lclaim:

:1. The method of cooling a heated, hollow mill-roll which comprisesspra 7 g water into the interior of said roll an forcing 65 a current ofslightly compressed air there-

